DocumentCode :
737578
Title :
Compact 0.92/2.45-GH Dual-Band Directional Circularly Polarized Microstrip Antenna for Handheld RFID Reader Applications
Author :
Liu, Qiang ; Shen, Junyu ; Yin, Jungang ; Liu, Hongli ; Liu, Yuanan
Author_Institution :
College of Electrical and Information Engineering, Hunan University, Changsha, China
Volume :
63
Issue :
9
fYear :
2015
Firstpage :
3849
Lastpage :
3856
Abstract :
This paper presents a compact 0.92/2.45-GHz dual-band directional circularly polarized (CP) microstrip antenna for handheld radio-frequency identification (RFID) reader applications. The proposed antenna comprises a wideband dual-feed network and two stacked concentric patches assembled by two orthogonally placed vertical probes. The dual-feed network feeds quadrature signals across the RFID bands between 0.92 and 2.45 GHz. The two stacked concentric patches provide resonance frequencies in fundamental mode for lower band and higher band, respectively. Additionally, the antenna features only one connection port and same sense CP radiation at two bands, beneficial to cost and complexity reductions of the dual-band front end of RFID readers. The measurement results show the performances of return loss (RL) {>} {10};{text{dB}} , 3-dB gain variation, and axial ratio (AR) {< } {text{3}};{text{dB}} are achieved on the bands 0.911–0.933 GHz and 2.40–2.57 GHz. The measured peak gains are 3.8 dBic at 0.926 GHz and 8.9 dBic at 2.48 GHz. In addition, the antenna provides symmetrical patterns with wide-angle half-power beamwidths and wide-angle 3-dB AR beamwidths. The size of the antenna {text{110}} \\times {text{110}} \\times {text{6}}.{6};{text{m}}{{text{m}}^{text{3}}} is much smaller than reported dual-band one port RFID directional CP reader antennas. The antenna appropriates to both ultra-high frequency (UHF) and industrial scientific and medical (ISM) bands in handheld RFID reader applications.
Keywords :
Directive antennas; Dual band; Microstrip antennas; Ports (Computers); Radiofrequency identification; Substrates; Circularly polarized (CP); Radio-frequency identification (RFID); circularly polarized (CP); compact; directional; dual-band; microstrip antenna; radio-frequency identification (RFID);
fLanguage :
English
Journal_Title :
Antennas and Propagation, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-926X
Type :
jour
DOI :
10.1109/TAP.2015.2452954
Filename :
7150369
Link To Document :
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